Gas mixing method and blowpipe apparatus



1 52 J. VILLORESI E-T AL- GAS MIXING METHOD AND BLOWPIPE APPARATUS Filed. Aug. 20, 1948 IIIIIIIIIII A \NVENTORS JOHN V\LLORESI THUR P SCHELLER I Patented Oct. 21, 1 952 GAS MlXlNG METHOD AND BLOWPIPE APPARATUS I John Villoresi, Lincoln Park, and Arthur P.

Scheller, Union, N. 3., assignors, by mesne assignments, to Union Carbide and Carbon Corporation, a corporation of New York Application August 20, 1948, Serial No. 45,235

'1 Claims. (01. its-27.4.)

- ,UNITED STATES T N OFFICE s 1 I v v This invention relates to method and 'appa- 26 for engaging the bore in the head H. The ratus for mixing combustion supporting and. annular shoulder at the top of the intermediate fuel gases in a blowpipe head. portion 22 is spaced with respect to the seats The conventional mix'ng of such gases is by 23 and 25 to form the upper part of the bore means of a nozzle located somewhere in back l2 into an annular fuel gas entrance chamber of the head of the blowpipe, generally in one of which receives acetylene from the inlet A. the connecting tubes between the handle and The diameter of the intermediate mixer porthe head. With this arrangement the particution 22 is less than the bore l2 bya small clearlar mixer required a particular nozzle, and the ance of the order of ten thousandths of an inch blowpipe was subject to flashbacks. or less, leaving a narrow annular channel there- Objects of the present invention are to probetween extending from the acetylene inlet vide a blowpipe mixer in the blowpipe head, to chamber to the preheat oxygen inlet chamimprove the mixing of the gases in the blowpipe, ber M 'which receives preheat oxygen from to adapt the blowpipe for interchangeable the inlet P which is preferably concentric with nozzles, and to improve the flashback resistance 5 the acetylene inlet A. The skirt portion 24 of of the blowpip the mixer engages a ring seal washer 21 received Other objects and features of novelty will be in an annular groove formed in the cavity C apparent from the following description and the below the seat 25.

accompanying drawings, in which: The interior of the mixer M has stepped bores Figure 1 is a vertical cross section through similar to the cavity C, and the nozzle N has a blowpipe head, showing apparatus according stepped diameters similar to the outside of the to, and for carrying out the method of the mixer, with conical seats therebetween, definpresent invention; and 7 ing a nozzle entrance preheat mixture chamber Figure 2 is a perspective view of the mixer 30. Angularly spaced downwardly inclined drillemployed in the blowpipe head of Figure l. 25 ings 32 through the mixer M connect the center The apparatus shown in the drawing comof the narrow mixing passage with the chamber prises a blowpipe head H having an inlet 0 which in turn distributes the preheat mixture for cutting oxygen, an inlet A for fuel gas such to the nozzle preheat passages 34.

as acetylene, and an inlet P for preheat oxygen. The nozzle N has a central cutting oxygen The head H has a cavity C of stepped bores passage 35, and the mixer M has a central respectively communicating with the gas inlets, passage 36 aligned therewith, nd communiand receiving a mixer M of correspondingly cating with the cutting oxygen inlet 0-. I stepped diameters. The mixer M in turn has In operation, fuel gas such as acetylene passes stepped bores which correspondingly receive from the inlet A into the acetylene inlet chamstepped diameters of a nozzle N. Thespacing ber formed by the innerend of bore 12 and of the interfitting portions of the cavity, mixer the shoulder of the mixer portion 22 and starts and nozzle leaves annular chambers through downthe narrow mixing passage between the which the fuel gas and preheat oxygen pass bore l2 and the mixer portion 22. At the and'efiect commingling thereof to form the presame time, preheat oxygen from the inlet P- heat mixture. The head mixer and nozzle have passes downwardly into the lower outer chamaligned central drillings 'forming a continuous 40 her l4 and then with an abrupt reversal of distraight central passage for cutting oxygen. rection starts up from the bottom of the an- The cavity C comprises an upper inner bore nular mixing passage between the bore l2 and Ill, an intermediate bore 12, and a lower outer the mixer portion 22. The descending narrow chamb A 601110811 Seat is provided annular stream of fuel gas meets the ascending tween the bores l0 and I2, and another conical narrow annular Stream of preheat oxygen headseat I5 is provided between the chamber l4 and on, midway between the ends of the mixing the outer end of the cavity C- passage, and the impact of the collision within T e miXer M comprises an upper al r e d such narrow confines creates maximum tur- J 20 en ring he r 10, an intermediate por ion bulence and consequent thorough intermingling 22 enter the bore and Skirt 24 entering of the gases to form the preheat mixture. The

the outer end of the cavity C, with intermediate mixture thus formed passes downwardly and conical seats 23 and 25 respectively engaging inwardly through the drillings 32 to the nozzle the cavity seats l3 and 15. The smaller end entrance preheat mixture chamber 30, which 20 is grooved to receive a r'ng sealing washer distributes it to the nozzle preheat passages 34,

The cutting oxygen from the inlet 0 passes municating respectively with said inlets, said through the bore l0 and mixer passage 36 to mixer and cavity b the nozzle cutting oxygen passage 35. spaced apart to for at is claimed is: between said chambers, said mixer having a 1. Method of mixing combustion supporting 5 cavity, a nozzle received in said inner cavity, and

prises intrcducingtheggases to be mixedintoseprowtpassagezthrough said, mixer to-said ,znozzle, arate axially spaced annular chambers, directing whereby the gases from said respective inlet ate the ends of said annular path, and directing the nozzle. the mixed gases from intermediate the;endsgof; 6. Apparatusefor, mixing combustion supportsaid annular path to the bIOWPiQBI QZZIBE ingsandiuel aseseina blowpipe head which comnarrow annular path ;to ilocalize the mixing zone, from, ,said chambersw toward ,each other, whereby whereby said annular streams impact reach gotherl thegases -meet head-on,intermediatelthe,endspf a intermediategthea ends ,of; said narrow annular," said annular path v and passages formedninpsaidl path.,; and directing theemixed ,gaseseirom inter? blowpiperheadrfor directinethemix dgases from mediatei-mhesenda of said, annular.v path tocthe; 25 intermediate'thelends oilsaid annular path, tolthe blowpipe nozzle= blowpiper nozzle. 3. .Method oil-mixing; combustion supporting '7. vApparatus, for mixing. combustion supporting; amt-fuel; gases; in: a zblowpipee head; which 100m: and zfuel ases in agblowp fir.had; which,c0m=-: prises directing zan annular stream ofr-thegtcome prisesr=ajmixer cooperating with, said blowjpine,

nozzle toward the nozzle outlet dlrectmg an an-- said mixercavityQsaid blowpipe head and mixer nular stream of the fuel gas to be mixed 1n the haying po tions cooperating to direct an annular same narrow confined annular path but backstream of combustion supporting gas in a direcjeoted to angabrupt reversal-v;of;direction during; intermediate l-thefends otsaidannular path,;.an'd

the ;mixin-g pp, erati0n tendinggto :minimize flash said-;-head having assagessfor anti.v gases from intermediate the-vends-pfi said, annular, 41; A blowpipewheadhavinga--.cav y andsp path to the blowpipe .nozzley wherebysaidlbaekinietsafon-oxidi in gand,-.fue1 QQSBS; nda mix r-: ward fiowinggfuel, asis subject-to an to said inletsas a-idlr isteringgecesses also; form-Q"v REFERENCE$ZCITEDZ 1 v s V Thelfollowingsreienencesr,areroi;record inlthee, filenofiithisbpasfientiij V endszof said annularzthroafito said nozzles: N TE PA ENTS- 5;.Aiblowpipe headhaymg a cavitvandspacedr- Number. Name, Date inlets for oxidizingqand --.fue1- gases, and amiXer.- 407,323\ Barker .,Ju1y ;2,3, .l8i39.; inserted} in; said: cavity and. having annularz. 1,549,420 Hofstetter P \Aug.. 11,.;.192,5;

groovesi registeringiwith corresponding,portions 1,9835%; Retreadingnec ulissas op said cayityto fvormz annular chambers come 2,365,316,- skinner nwgwn ulanl16;}955.' 

